Francis L. Wellman, The Art of Cross-Examination — Chapter 9 (1903)
“ IV. If you perceive that the mind of the witness is imbued with prejudices against your client, hope but little from such a quarter—unless there be some facts which are essential to your client's protection, and which that witness alone can prove, either do not call him, or get rid of him as soon as possible. If the opposite counsel perceive the bias to which I have referred, he may employ it to your ruin. In judicial inquiries, of all possible evils, the worst and the least to be resisted is an enemy in the disguise of a friend. ”
